With IPHost Network Monitor you can run simple snmp requests against a Nortel device in your network.
vrIpxHoldDownInterval
Virtual Router Ipx Hold Down Interval
This attribute specifies an interval, after a network is removed from the route table, during which other incoming route updates for the same network will be ignored. The use of this interval prevents the slow convergence which results when switches that receive late network down broadcasts advertise false routes.
Back to Nortel-Magellan-Passport-IpxMIB MIB page.
IPHost Network monitor allows you to monitor vrIpxHoldDownInterval on Allied Telesis device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Nortel switches right now.